Submission #896404

#	Time	Username	Problem	Language	Result	Execution time	Memory
896404		math_rabbit_1028	Magic Tree (CEOI19_magictree)	C++14	37 / 100	2067 ms	837420 KiB

magictree

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
int n, m, k, par[101010];
pii arr[101010];
vector<int> adj[101010];
map<int, ll> dp[101010];

ll solve(int v, int d) {
    if (dp[v].find(d) != dp[v].end()) return dp[v][d];
    ll a = 0, b = arr[v].second;
    for (int i = 0; i < adj[v].size(); i++) {
        int u = adj[v][i];
        a += solve(u, d);
        if (arr[v].first >= 1 && arr[v].first <= d) b += solve(u, arr[v].first);
    }
    if (arr[v].first >= 1 && arr[v].first <= d) return dp[v][d] = max(a, b);
    else return dp[v][d] = a;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> m >> k;
    for (int i = 2; i <= n; i++) {
        cin >> par[i];
        adj[par[i]].push_back(i);
    }
    for (int i = 1; i <= m; i++) {
        int v, d, w;
        cin >> v >> d >> w;
        arr[v] = {d, w};
    }

    cout << solve(1, k) << "\n";

    return 0;
}

Compilation message (stderr)

magictree.cpp: In function 'll solve(int, int)':
magictree.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for (int i = 0; i < adj[v].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 3 / 3
• Subtask 3: 0 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 0 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17